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2021 ◽  
Vol 937 (3) ◽  
pp. 032079
Author(s):  
Vladimir Opolskii ◽  
Maria Stupina

Abstract Since the importance of storing information has risen in early 2010’s, devices being used by people are continuing to change, showing the trend of transitioning on to the faster and more advanced storage technologies. Most of unexperienced users are unaware of benefits of current generation drives, such as various types of SSDs, and continue using legacy disks, unwillingly crippling their user experience. To determine the popularity of different storage devices, a questionnaire has been conducted. In this article testing of currently present consumer-grade storage devices mostly with use of software called AS SSD Benchmark, can be found. Also, comparison of the most crucial performance metrics has been conducted during the study, which lead to a conclusion that modern storage technologies such as SSDs and Cloud storage, provide a great solution to a problem of processing data, as well as storing big volumes of it.


Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1344
Author(s):  
Fadoua Elmahdoubi ◽  
Safaa Mabroum ◽  
Rachid Hakkou ◽  
Mounsif Ibnoussina

The pozzolans of the Moroccan Middle Atlas are derived from a low explosive volcanism, mostly strombolian. They are mainly composed of olivine and pyroxene, presenting a less homogeneous structure (irregular vesicles). The main target of this project is to study the use of natural pozzolans (NP) and metakaolin as precursors for the production of geopolymeric binders. The characterization of raw materials and elaborated geopolymers was carried out to study their mineralogical, chemical, microstructural, and mechanical properties. The studied pozzolans and kaolin were crushed, grinded, and sifted to get a fine grain size diameter of less than 100 µm. Then, they were calcined at 750 °C for 2 h to achieve an amorphous structure, increasing of their reactivity. Geopolymer production consists of mixing pozzolans and metakaolin with different amounts with an alkaline solution of sodium hydroxide and sodium silicates. The mass proportion of metakaolin (MK) used in this study was 10%, 20%, and 30%. In the present work, the amount of metakaolin was added as a source of alumina. The elaborated geopolymers were characterized using XRD, FTIR, TGA, and SEM analyses. The compressive strength was measured at 7, 14, and 28 days. The results showed interesting mechanical proprieties at about 18 MPa at 28 days with the mixture containing 20% MK. The addition of MK showed a significant increase in mechanical properties of the elaborated geopolymer. Meanwhile, the other results confirmed the training of new phases in addition to N-A-S-H gel. All these results indicate that the use of pozzolans in the production of geopolymers could be a great solution for the sustainable management of this mineral resource.


2021 ◽  
Vol 2107 (1) ◽  
pp. 012007
Author(s):  
Mohd Fauzi Abu Hassan ◽  
Azurahisham Sah Pri ◽  
Zakiah Ahmad ◽  
Tengku Mohd Azahar Tuan Dir

Abstract This paper investigated single target tracking of arbitrary objects. Tracking is a difficult problem due to a variety of challenges such as scale variation, motion, background clutter, illumination etc. To achieve better tracking performance under these severe conditions, this paper proposed covariance descriptor based on multi-layer instance search region. Our results show that the proposed approach significantly improves the performance in term of centre location error (in pixels) compared to covariance descriptor with using a fixed bounding box. From this work, it is believed that we have constructed a great solution in choosing best layer for this descriptor. This will be addressed in the next future work such as consider target motion during tracking.


Humans have always had an impact on their surroundings. Solid waste is one of our biggest effects on nature. Unlike other animals, humans create too much waste for nature to keep up. With the continually rising of the earth’s population, the situation is going to get harder and harder to slow it down, or fix it. With garbage pollutioncomes; from the burning of garbage we are destroying the atmosphere just as fast as we are just leaving the garbage on the ground. When you burn garbage it gives off extremely poisonous gases into the atmosphere. If a person breathes this air it can hurt their lungs and if untreated can result in cancers or even death. Even if we burry our garbage not all of it will decompose, as there are some material needs centuries to decompose. By polluting the ground it can seep into our farming soil and even into our ground water, which can cause dramatic consequences.Compacting trashes is considered a great solution for the problem of throwing garbage as it was examined in well developed countries and solved the problem of thrown garbage in the streets or burning extra garbage which is the same problem that each developing countryis facing, and in result it also reduce the pollution amount due to the smoke of burning garbage and the diseases caused because of the uncovered garbage in streets where people walk through and others live nearby


2021 ◽  
Vol 9 (1) ◽  
pp. 41-48
Author(s):  
Febry Wijayanti ◽  
Irina Turgel

Nowadays, the rest of the world concentrates on increasing global economies through the development of technology and productivity growth. This intent creates uneven economic opportunities, inequality, and social disparity between developed, developing, and undeveloped countries. On the other hand, the discrepancy between them contributes to increasing the migration flow, particularly in ASEAN. Moreover, the population movement between Indonesia-Malaysia majority is a low-skilled migrant and brings several problems for both countries. Thus, the scheme of social protection for a migrant becomes a crucial matter to implement. Hence, this paper aims to acknowledge the migration flow and assess Indonesia and Malaysia's social protection schemes. The result shows that distance is an essential variable of Indonesia's worker migrant than Malaysia's wage rate. Hence, the discourse for stopping worker migrants, particularly domestic workers, is not a great solution. Notably, the government should create a proper MoU with Malaysia to protect worker migrants, particularly domestic workers.


2021 ◽  
Vol 13 ◽  
pp. 175628722199813
Author(s):  
Mai Ahmed Banakhar

Objective: To study the effect of the COVID-19 pandemic on sacral neuromodulation (SNM) implanted patients and examine patient concerns. Methodology: A web-based survey was sent to all SNM patients, including those with implants and who had a cancelled operation because of the pandemic. The survey consisted of 15 questions in Arabic language, which sought to evaluate outcomes, as well as patient concerns and preferences during the COVID-19 pandemic. Results: A total of 66 patients were contacted, and of which, 62 replied. Most of the patients ( n = 51; 82.3%) had the device implanted, and 11 (17.7%) patients had a postponed operation secondary to the pandemic. There were 20 males and 42 females. The mean age was 34 years ± SD 16.5 (9–62 years). Indications for sacral neuromodulation therapy were refractory overactive bladder OAB 35 (56.5%), retention 17 (27.4%), OAB + retention 3 (4.8%). When questioning the effect of the lockdown on patients, most reported no effect (43.5%), while 14.5% had some programming difficulties. The patients preferred telephone calls for device emergencies and clinic follow-up with 88.7% and 98.4%, respectively. Most patients had no concerns regarding their Interstim device during the pandemic and found it manageable; 8.1% had insurance concerns due to the economic changes. Conclusion: Patients with implanted SNM for lower urinary tract symptoms were mainly concerned with device programming. Telemedicine is a great solution for continuous care in this group.


2020 ◽  
Vol 35 (Supplement_3) ◽  
Author(s):  
Ramia BENHAMOU ◽  
Hajar ELASSAS ◽  
Meriem Chettati ◽  
Wafaa Fadili ◽  
Inass Laouad

Abstract Background and Aims Hypertension in subjects on long term dialysis is frequent. Intradialytic hypertension affects up to 20% of hemodialysis patients and occurs more frequently in patients who are older, have lower dry weights, are prescribed more antihypertensive medications. Elevated BP detected by home or ambulatory BP monitoring is clearly associated with shorter survival. Method We realized a cross sectional study in two hemodialysis center patients during october 2019. We compared two groups of patients: group 1 with HTA (HTA+) and the second without (HTA-). Prevalence of hypertension intra dialysis (increase in systolic BP > 15mmHg during dialysis) was determined by blood pressure recordings every thirty minutes during hemodialysis. We collect information about prescription patients (bolus dose of IV nicardipine or administration of captopril orally) after HTA inicident. We collected and analyzed datas of 1476 hemodialysis sessions for 123 patients. Results The mean age of your patients was 46 ± 26,3 years with a female predominance. The mean duration of hemodialysis was 9,8 years. The initial nephropathy was hypertensive in 14,6%. 44,7% (n=55) patients used at least one antihypertensive treatment (HTA+ group), in 72,7% calcic inhibitor. Hypertension crisis in HTA+ group was higher than HTA- group, respectively 37,9% and 4,7% (p=0,0002). Concerning HTA+ group, in 9,35% of cases patients receveid IV bolus of nicardipine, 7,9% captopril and 17,9% of cases have not receveid any antihypertensive medication. In HTA- group they receveid IV nicardipine on only 2,5% cases and no drugs in half of all cases. Patients who were older and receive erythropoietin-stimulating agents were more likely to exhibit an increase in SPB despite similar amounts of ultrafiltration in each groups. It appears HTA- group had better control of hypertension crisis in 77,5% versus 65,5% in HTA+ group, at 20minutes of crisis (p= 0,004). Administration of captopril in the both group allowed better control of hypertension 90% (HTA+ group) and 84,2%(HTA- group). Hypertension crisis was more controlled in group with high ultrafiltration rate with administration of captopril . Conclusion Use of ACE inhibitors during dialysis to manage hypertension crisis appears a great solution and confirm hypothesis of activation of the renin–angiotensin–aldosterone system. Treatment of intradialytic hypertension may include careful attention to dry weight, avoidance of dialyzable antihypertensive medications, limiting the use of high calcium dialysate, achieving adequate sodium solute removal during hemodialysis, and using medications which inhibit the rennin-angiotensin-aldosterone system or which lower endothelin 1.


2019 ◽  
Vol 10 (1) ◽  
pp. 289 ◽  
Author(s):  
Kuldeep K. Bansal ◽  
Deepak K. Mishra ◽  
Ari Rosling ◽  
Jessica M. Rosenholm

Mesoporous silica nanoparticles (MSNs) find tremendous applications in drug delivery due to several advantages such as their easy fabrication process, high drug loading, biodegradability, biocompatibility, and so forth. Nevertheless, despite several advantages, the use of this striking drug delivery carrier is restricted due to premature drug release owing to the porous structure. Coating of the pores using polymers has emerged as a great solution to this problem. Polymer coatings, which act as gatekeepers, avoid the premature release of loaded content from MSNs and offers the opportunity for controlled and targeted drug delivery. Therefore, in this review, we have compiled the polymer-based coating approaches used in recent years for improving the drug delivery capability of MSNs. This manuscript provides an insight into the research about the potential of polymer-coated MSNs, allowing the selection of right polymer for coating purposes according to the desired application.


2019 ◽  
Vol 11 (3) ◽  
pp. 90-102
Author(s):  
Khalid El Makkaoui ◽  
Abderrahim Beni-Hssane ◽  
Abdellah Ezzati

Homomorphic encryption (HE) is an encryption form that offers a third-party with the ability to carry out computations on encrypted data. This property can be considered as a great solution to get over some obstacles limiting the wide-spread adoption of cloud computing (CC) services. Since CC environments are threatened by insider/outsider security attacks and since CC consumers often access to CC services using resource-limited devices, the HE schemes need to be promoted at security level and at running time to work effectively. For this reason, at EMENA-TSSL'16 and at WINCOM'16, the authors respectively boosted the RSA and ElGamal cryptosystems at security level, Cloud-RSA and Cloud-ElGamal. At SCAMS'17 and at EUSPN'17, the authors then suggested two fast variants of the Cloud-RSA scheme. All proposed schemes support the multiplicative homomorphism (MH) over the integers. The aim of this article is to compare the Cloud-ElGamal scheme with the Cloud-RSA schemes. This article first briefly presents the HE schemes and analyzes their security. This article then implements the schemes, compare and discuss their efficiency.


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